Photos

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Cooke City, 2019-12-14

From IG post: "Pictures don’t do this monster avalanche justice. We helped the kid recover his sled, which was buried between 4and 10 feet. luckily it wasn’t him and no one was hurt." @mackleymtvet

Link to Avalanche Details
Cooke City, 2019-12-14

From IG post: "Pictures don’t do this monster avalanche justice. We helped the kid recover his sled, which was buried between 4and 10 feet. luckily it wasn’t him and no one was hurt." @mackleymtvet

Link to Avalanche Details
Cooke City, 2019-12-14

From email: "Saw 3 different slides today, all had sled tracks near or into them, and were breaking from rocks.... The other slides were smaller, had broken from rocks at the top of ridges.... Crown butte, SE facing" Photo: S. Strenge

 

Link to Avalanche Details
Southern Madison, 2019-12-13

On Friday (12/13) there were natural avalanche crowns in Carrot Basin of Taylor Fork. These were a few days old, but show the potential to trigger slides on a buried persistent weak layer. Photo: GNFAC

Link to Avalanche Details
Southern Madison, 2019-12-13

On Friday (12/13) there were natural avalanche crowns in Carrot Basin of Taylor Fork. These were a few days old, but show the potential to trigger slides on a buried persistent weak layer. Photo: GNFAC

Link to Avalanche Details
Southern Madison, 2019-12-13

On Friday (12/13) we rode into Taylor Fork and found a weak foundation of the snowpack, Recent snow has created unstable conditions. Our stability tests showed unstable results on two weak layers. Photo: GNFAC

Cooke City, 2019-12-13

Riders triggered this avalanche from flat terrain nearby on Friday (12/13). Recent snow has created unstable conditions, and this is evidence that instability may persist for a while.

Link to Avalanche Details
Northern Madison, 2019-12-10

Natural avalanches were reported on Buck Ridge on 12/8. They likely broke on recently buried surface hoar. photo: @gslo87

Cooke City, 2019-12-09

Outside Cooke City we dug this pit at 9800 feet on Scotch Bonnet (Dec 9). It broke on a layer of facets that formed a few days before Thanksgiving and is now buried under 1.5' of snow. The recent storm made this layer reactive. Photo: GNFAC

Cooke City, 2019-12-09

This avalanche on Crown Butte outside Cooke City occurred naturally on Dec 8. It is a NE facing slope above Daisy Pass. This slope is heavily wind-loaded. Photo: GNFAC

Link to Avalanche Details
Cooke City, 2019-12-09

This south-facing slope on Scotch Bonnet, outside Cooke City, naturally avalanched on Dec 8. It is a wind-loaded slope and may have failed on a layer of facets 2 feet below the surface. Photo: GNFAC

Link to Avalanche Details
Lionhead Range, 2019-12-09

Skiers at Targhee Pass near West Yellowstone reported: "We got a few good collapses while skinning up through east-facing low angle meadows, and got some serious cracking and collapsing while stomping on fresh wind pillows just below ridgeline on a northeast-facing slope at about 8200'. We dug down at one of the cracks and found a 35cm thick F+ slab that had failed on a layer of 4-6mm depth hoar. Cracks propagated close to 100'..." Photo: A. Schauer

Link to Avalanche Details
Bridger Range, 2019-12-09

From Obs: "Out poking around the Northern Bridgers today and found some really terrible structure... We dug a couple of pits and both exhibited terrible structure with pronounced facet layers between the most recent pair of melt-freeze and rain crusts.

Results from one of the pits were: 7900' NE aspect 33 degree slope HS95cm (photo included)
- ECTP12@60cm on 2mm well developed facets below most recent M/F crust
- Weak facetted layer is 5cm thick 4F- hardness
- Slab above is a 4F to 1F hardness slab of new graupel and decomposing grains on top of the 1F+ M/F crust..." 

Photo: Z. Miller

Northern Madison, 2019-12-09

Riders reported multiple natural slab avalanches on N facing slopes. Photo: R. Rustigian

Link to Avalanche Details
Northern Madison, 2019-12-09

Riders reported multiple natural slab avalanches on N facing slopes. Note widespread crowns along slope in background. Photo: R. Rustigian

Link to Avalanche Details
Cooke City, 2019-12-08

A snowmobiler triggered an avalanche (yellow pin) north of Crown Butte (the gray mountain at the top of the image). This zone is typically approached from Lulu Pass. His sled was partially buried, but the rider was not. Lots of new snow in the last 24 hours created a CONSIDERABLE avalanche danger.

Link to Avalanche Details
Cooke City, 2019-12-08

This natural avalanche on the northeast side of Crown Butte near Daisy Pass (Cooke City) almost caught people below. Approximately 2 feet of snow has fallen with wind and the avalanche danger is rated CONSIDERABLE. Photo: B. Whittle

Link to Avalanche Details
Northern Madison, 2019-12-08

From obs.: "Dug a pit just over the ridge from Beehive Basin into Middle Basin on a part of the slope that was less wind-affected than the rest. Performed an ECT and got a result of ECTP-24. The failure occurred on what appeared to be the same layer that was observed at Buck Ridge earlier this week - a thin layer of facets underneath a fairly solid crust (found approximately 30 cm from the surface). Given this observation, we decided to take it easy and ski some low angle meadows down into bear basin." Photo: E. Telford

Lionhead Range, 2019-12-07

Photo taken 12/6 near Two Top, south of West Yellowstone.

From email: "South facing stuff was thinner than I expected and north and west facing was a lot better than I expected. South facing stuff was 59cm deep and we had multiple ECT-P 14’s between the facets at the bottom and the newer snow."

Photo: B. Radecky

Bridger Range, 2019-12-05

We went to look at the snowpack on Saddle Peak in the backcountry south of Bridger Bowl (12/5/19). Heavily wind loaded slopes have hard slabs over weak facets. Unfortunately this poor snowpack structure will be with us for a while in the backcountry. It will not get compacted by skier traffic or show obvious signs of instability. SKi patrol triggered this slide just inside their boundary. This is the first time they have done control this season, so it is a glimpse of what we might find in the uncontrolled backcountry snowpack. Photo: GNFAC